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Second
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| Submultiples | Multiples | ||||||
|---|---|---|---|---|---|---|---|
| Value | SI symbol | Name | Value | SI symbol | Name | Equivalent to | |
| 10−1 s | ds | decisecond | 101 s | das | decasecond | 10 seconds | |
| 10−2 s | cs | centisecond | 102 s | hs | hectosecond | 1 minute, 40 seconds | |
| 10−3 s | ms | millisecond | 103 s | ks | kilosecond | 16 minutes, 40 seconds | |
| 10−6 s | µs | microsecond | 106 s | Ms | megasecond | 11 days, 13 hours, 46 minutes, 40 seconds | |
| 10−9 s | ns | nanosecond | 109 s | Gs | gigasecond | 31.7 years | |
| 10−12 s | ps | picosecond | 1012 s | Ts | terasecond | 31,700 years | |
| 10−15 s | fs | femtosecond | 1015 s | Ps | petasecond | 31.7 million years | |
| 10−18 s | as | attosecond | 1018 s | Es | exasecond | 31.7 billion years | |
| 10−21 s | zs | zeptosecond | 1021 s | Zs | zettasecond | 31.7 trillion years | |
| 10−24 s | ys | yoctosecond | 1024 s | Ys | yottasecond | 31.7 quadrillion years | |
- Snippet from Wikipedia: Second
The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as 1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). "Minute" comes from the Latin pars minuta prima, meaning "first small part", and "second" comes from the pars minuta secunda, "second small part".
The current and formal definition in the International System of Units (SI) is more precise:
The second [...] is defined by taking the fixed numerical value of the caesium frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9192631770 when expressed in the unit Hz, which is equal to s−1.
This current definition was adopted in 1967 when it became feasible to define the second based on fundamental properties of nature with caesium clocks. Because the speed of Earth's rotation varies and is slowing ever so slightly, a leap second is added at irregular intervals to civil time to keep clocks in sync with Earth's rotation.
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Time: Time in Buddhism, Present Fresh Wakefulness, Present Moment, Now, Three Times (Past-Present-Future), Today in History, Dates and times in programming languages: Programming language dates and times, Programming language dates, Programming language times: Java Time (java.time - java.time.chrono, java.time.format, java.time.temporal, java.time.zone), Java Chronology, Kotlin Time, Scala Time, Clojure Time, Groovy Time, JavaScript Time - TypeScript Time, Python Time, Bash Time, C Time, C++ Time, C# Time, COBOL Time, Dart Time, Fortran Time, Golang Time, PowerShell Time, Ruby Time, Rust Time; Date format - Time format, calendar (Module calendar), time (Module time, Time conversions, time zones (zoneinfo, Module zoneinfo, IANA time zone database), date (dateutil, Package dateutil, Orders of magnitude (time) (Millennium-Millenia, Centuries, Decades, Years, Months, Weeks, Days, Hours, Seconds, Nanoseconds, Picoseconds, Millisecond, Microsecond), International System of Units, Jiffy (time), date-time API, Temporal, Temporary, Speed - Velocity, Slow-Fast, Performance: Time Performance - Time Benchmark - Timing, Latency, Y2K, Time Travel, Memory - Remember, Lifetime-Time of Life (Birth-Old Age-Sickness-Death-Bardo-Rebirth), GitHub Time, Awesome Time. (navbar_time)
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